Bath tub



FIG. 1 is a top plan view of a bath tub showing my new design;

FIG. 2 is a cross-sectional view thereof as taken along line 2--2 inFIG. 1;

FIG. 3 is a top perspective view thereof;

FIG. 4 is a left side elevational view thereof, the right side being amirror image; and

FIG. 5 is a rear elevational view thereof.

The ornamental design for a bath tub, as shown and described.